docs: def compute_busiest_date(feed: "Feed", dates: List[str]) -> str:
      """
      Given a list of dates, return the first date that has the
      maximum number of active trips.
  
      Notes
      -----
      Assume the following feed attributes are not ``None``:
  
      - Those used in :func:`compute_trip_activity`
  
      """
      f = feed.compute_trip_activity(dates)
      s = [(f[c].sum(), c) for c in f.columns if c != "trip_id"]
      return max(s)[1]